these 2 derivations will be built:
  /nix/store/9bvqxa8i2sxv9240xpv13rw6y2z1lz0b-flake-inputs.drv
  /nix/store/jxr6q97znqdbvx6wwhlnf3i7l7yrqc8v-check-flake-inputs.drv